Telephone system.



C. A. SIMPSON.

TELEPHONE SYSTEM. APPLICATION FILED NOV. 16. 19x2.

Patented Aug. 7,1917.

2 SHEETS SHEET l- IZEJZEE H5527? 5 ZZZ/5277511 C. A. SIMPSON.

TELEPHONE SYSTEM.

APPLICATION FILED NOV. 16.1912.

Patented Aug. 7, 1917.

2 SHEETS- SHEET 2.

gamma- 8, 1915, and

CHARLES A. SIMPSON,

OF IVION'IIGELLO, FLORIDA, ASSIGNOR TO KELLOGG SWITCH- IBOARI) AND SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented Aug. '7, 1917.

Originalappfication filed .Tune 2, 1910, Serial No. 564,563. Divided and this application-filed November 16,

1912. Serial No. 731,719.

To all whom it may concern:

Be it known that 1, CHARLES A. SIMPSON, a citizen of the United States of America, residing in Monticello, county of Jefferson, and State of Florida, have invented certain new and useful Improvements in Telephone Systems, of which the following is a speci fication. f

My present application is a division of my Letters Patent, No. 1,141,982, granted June the present invention relates to telephone systems, being directed more particularly to telephone systems having mechanically associated relays or electromagnets arranged in pairs whereby one relay or magnet of a. pair isactuated to display a signal and thereafter the other relay or magnet of the pair is actuated to efface the signal, or if the signal efi'acing. relay is actuated first, the signal is not displayed even though the signal displaying relay is thereafter actuated.

Where such a. pair of relays or electromagnetsare used as line and cut-0E relays, it is necessary for the line relay which usually controls the initial display of the signal to operate through the resistance of the line circuit, and I have found the relay claimed in the parent sensitive so as to operate over lines of 34000 ohms resistance whichis especially desirable when used in connection with the long lines such as toll lines, while the cut-off relay which controls the eiiacement of the signal is usually operated over a local circuit and therefore need not be so sensitive. I

An object of the present invention is to provide a system having such a pair of mechanically and electrically connected relays to perform the functions stated above, that is to control such a line signal. Another object of my invention is to provide a system in which such cooperating relays or electromagnets are associated with an operators cord circuit for controlling the supervisory signals. I

Referring now to the accompanying drawings in which all parts are shown at normal and in which like reference characters indicate like parts, I

Figure 1 is a side elevation of one form of relay employed in my invention;

Fig. 2 is a plan view of the structure of Fig. 1; Y

application to be very Fig. 3 is an end view of. the same; Fig. 4 is another form of relay adapted for use with my invention; I i

Fig. 5 is an end view of the structure of Fig. 4

Fig. 6 shows the spring combination of the vention.

Referring now to the relay shown in Figs. 1, 2 and 3, a pair of electromagnets 1 and 2 are shown secured to the mounting plate 3.

' The pole pieces 4 and 5 are secured to their respective cores 6 and 7 and mounting plate 3. The armature 8 is pivotally connected to the bracket 9 below the core 6, the said bracket being screwed to the spool head 10 of the electromagnet 1. The block 11 is fastened to the armature 8, the said block 11 being adapted to retract the armature 8 by gravity. The adjustable stop-nut 12 limits the retraction of the armature 8. Secured to the top of the pole piece 4 are the contact springs 13 and 14, the spring 13 resting under tension and engaging the upper free edge of the armature 8 by means of the catch 13 Secured to the pole piece 5 are two sets of contact springs 15 and 16, the said sets each comprising two springs 17 and 18 as shown in Fig. 6. The said contacts which are normally closed are adapted to be opened, the upper springs being moved to their alternate position by the armature 19, the said armature 19 being adapted to rock on the upper edge of the pole piece'5. The arm 20 is secured to the armature 19 by the screws 21, the said member extending below the contact spring 13 and being adapted to lift the said spring '13 to return said spring to its normal position after the armature 8 has been attracted.

The operation of the relay shown in-Figs. 1, 2 and 3 is as follows: the armature 8 is attracted, allowing the spring 13 to move to its alternate position, contactingwith the spring 14, the catch 13 dropping and engaging the armature 8 to hold it in its attracted position. To again open the contacts of the springs '13 and 14 the armature 19 is attracted, moving the arm 20 upward,

the buifer 20 thereby engaging the spring 13, opening the contacts of springs 13 and 14 and lifting the catch 13 free of the upper edge of the armature 8, allowing the said armature 8 to detract. When the armature 19 is now detracted the arm 20 moves downward, allowing the catch 13 of the sarin 13 to a ain en a e theuaoer ed e b b 23 U 23 of the armature 8, as shown in Fig. 1.v The attraction of the said armature 19 also moves the contact springs 15 and 16 to their alternate position holding them thus while the said armature 19 remains attracted.

It is obvious that if the armature 19 is first actuated, the arm 20 moves upward, engaging the contact spring 13 and holding the said spring 13 in its normal position 'even though the armature 8 be attracted while the said armature 19 remains attracted.

Referring now to the relay shown in Figs. 1, 5 and 6, the electromagnets 25 and 26 with their respective pole pieces 27 and 28 are secured to the mounting plate 29 by the nuts 30. The armature 31 rocks at the upper edge of the pole piece 28 and when attracted to the core 32, moves the extension upward against the tension of the spring 3 1. The said armature 31 is held close to the pole piece 28 by the adjustable nut 12. The arm 35 is secured to the armature 31 by means 015 the screws 35 the part of the arm 35 extending above the rocking edge moving toward the right when the armature 31 is attracted. The armature 36 rocks on the upper edge of the pole piece 27 in a manner similar to that of armatures 31 and 19, the said armature 36 being held close to'the pole piece '27 by the adjustable nut 37. Mounted on top 01"? the pole piece 27 are the springs 17, 18 and 17 18 these two sets being similar to the springs shown in Fig. 6. The contact springs 38 and 39 are also mounted on the pole piece 27, thespring 38 normally resting under tension in engagement with the catch end 10 or the arm. 35, the said spring 38 "being held in its normal position by this engagement.

The operation of the relay of F igs. 4:, 5, and 6 is as follows: The armature 31 is attrac'ted by the e'lect'romagnet 26, moving the catch 10 of the arm 35 out of engagement with the contact spring 38, allowing the said.

spring 38 to move to its alternate position to contact with the spring'39, and locking the armature 31 in its attracted position.

To restore the contact spring 38, the electromagnet 25 is now energized, attracting the armature 36 and the butter 4:1 engages the contact spring38, moving it upward to its normal position out of engagement with the contact spring 39. This allows the armature 31 to retract, the catch 4C0 thereby again moving to a point below the contact spring 38 and when the armature 36 retract-s attracted, so that even if the armature 31 is attracted while the armature 36 is held attracted, the contact springs 38 and 39 will fail to close.

Referring now to Fig. 7, A is a wellknown form of local battery subscri'bers telephone set having a switch hook 5'0, the

hand generator 51 and customary receiver,

induction coil, transmitter, local battery and call bell. The said telephone at A is connected to the exchange by the line limbs 52,

and 53 terminating in the spring jacks J.

*Associated with the line of subscriber at A is the magnet LR, magnet CO and the lamp signal L, the magnets being a diagrammatic representation of the relay of Figs. 1 to '6.

The subscribers telephone at 13 includes the same apparatus as that shown in connection with the subscriber at A, being connected to the exchange to apparatus similar to that shown in connection with the line of the subscriber at A and having the same reference characters, but having the exponent thereafter.

The cord circuit of Fig. 7 includes the usual answering plug P, calllng plug P and the operators set 0 with the test relay 54. The answering supervisory lamp 55 and calling supervisory lam-p 56 are respectively controlled by the relays AS and CS, each of the said relays including two electromagnets, mechanically cooperating as shown in the relay of Figs. 1, 2 and 3 or the relays shown in Figs. 4:, 5 and 6.

Fig. 8 which is a common battery telephone line, includes the subscribers station C connected to the jacks J by the line limbs 57 and 58. Associated with the said line is the line-lamp 59, the magnet LR- and CO the said magnets being a diagrammatic representation of the relay of Figs. 1, 2 and 3 or of Figs. 4, 5 and '6.

Referring now to Fig. 7, the operation of the system shown therein is as follows: The subscriber at A operates the hand generator 51, closing a circuit through the relay LR- from one pole of the said generator,

LR, normal contact 16, line limb 52 to the other @pole of the said hand generator 51. This circuit energizes magnet LR attracting the armature 8 and thereby allowing the spring 13 to contact with the spring 14:, cl0sing the circuit from ground through contacts 13, 14, line lamp L to battery, lighting the said lamp and attracting the attention of the operator. I The armature 8 is now held in its attracted position due to the spring 13 dropping down and engaging the said armature 8. After operating the hand generator the subscriber at A removes his receiver from its switch-hook which moves upward closing the upper contacts and the switch-hook. The operator now inserts the plug P in the jack J closing a circuit from battery through plug sleeve 61, jack sleeve 62, the windings of relay CO to ground, en-

ergizing the said relay and opening the contacts 15 and 16, also lifting the arm 20 which engages the spring 13 and lifting the Assuming that the subscriber at A desires connection with the subscriber at B, the operator touches the tip 72 of the plug P to the sleeve 62 of one of the multiple jacks J and if the line of the telephone B is busy, there will be a potential above that of ground, on the said sleeve 62 and a circuit will be traced from battery potential on the said sleeve, through tip 72, normalcontact 68, the winding of relay 5A to ground, energizing the said relay and closing a circuit through the tertiary winding of the operators induction coil from ground at alternate contact 67, through the said Winding to battery. This causes a click in the operators receiver and notifies the operator that the line of the desired subscriber is busy.

Assuming that the said called-forline is idle, there will be no potential above that of ground on the sleeve 62 and therefore the relay 54: will fail to energize when the tip 7 2 of the plug 1? is touched against the sleeve 62 of the ack J The operator now inserts the plug P into a jack J energizing the relays 69 and CO over a path traced from battery through the Winding of the said relay 69, the plug sleeve 70, ack sleeve 62 the Winding of magnet CO to ground,

energizing said relays 69 and C0 The energization of the magnet CO disconnects the magnet L11 from the line of the called subscriber at L and the energization of the relay 69 disconnects the test relay 54 from the tip 7 2 of the plug P and connecting the said tip 72 to the upper talkingstrand of the cord circuit and extending the connection from the subscriber at A to the subscriber at B.

The operator now closes the contacts of the ringing key It closing a circuit from onepole of the alternating generator G, alternate contact 68, plug tip'contact 72, jack contact 65 line limb 52 the call bell of the subscriber at B, normal contact 60 switch hook 50 line limb 53 jack contact 66 )lug contact 73, to ground at the ring ing key R. The subscriber at B in response to the said signal removes his receiver from its switch-hook, disconnecting the bell and hand generator from the line and closing the upper. contacts of the switch hook, thereby closing the circuit through the transmitter, battery and primary winding of the induction coil and closing the line limbs through the secondary of the induction coil.

The subscribers at A and B are now connected in a conversational circuit, the said circuit being traced over the heavily marked conductors and through the condensers G and C The subscribers having finished their con versation, now replace their receivers upon their respective switch-hooks, and thereafter operate the hand generators for disconnection. The operation of the hand generator 51 of the subscriber at A closes a circuit of' alternating current through the coil 73 of the cord circuit traced over the following path: From one pole of the hand generator 51, through alternate contact 60, normal contact of the switch-hook 50, line limb 53, contacts 65, 63, conductor 74, throughthe winding of the said magnet 73, conductor 7 5, contacts 64', 66, line limb 52 to the other pole of the generator 51. This current energizes the magnet 73 attracting the armature 76, and allowing the spring 77 to move to its alternate position and contact withthe spring 78. This closes a circuit through the supervisory lamp signal 55 from 7 ground through contacts 7 7 7 8, the said lamp signal 55. to battery, lighting the said lamp 55. The armature 7 6 is held in its attracted position due to the spring '77 moving downward and engaging the said armature.

The operation of the hand generator 51 of the called subscriber at B actuates the magnet 7 9 by current traced over the following path. From one pole of the alternating generator 51 alternate contact 60 normal contact of the switch-hook 50 line limb 53 contacts 66 '73, conductor 80, through the winding of the said magnet 79, conductor 81, alternate contact 68, contacts 72, 65 line limb 52 to the other pole of the generator 51 This current ener- 82 and allowing the spring 83 to move down- 'war'd to its alternate position, contacting with the spring 843 and closing a circuit gizes the magnet 7 9 attracting the armature through the supervisory lamp signal 56 from ground through contacts .83, 84 the said supervisory lamp signal 56 to battery, lighting the said lamp. The armature 82 is held in its attracted position by the engagement of the spring 83, in a manner simiar to ha o e mat re 7 6 of magne 73. The two lamps .55 and 56 now being lighted, the operator is notified that disconnection is desired. The operator now actuates the key K to efi'ace the two lamp signals 55 and 56 by closing a series circuit through the magnets 85 and 86 from ground through contact 87, through the windings of the said magnets 85 and 86 to battery, energizing the said magnets and attracting their respective armatures 88 and 89 The attraction of the armature 88 moves the arm 90 to engage the spring 77 which is in its alternate position, and continuing in its upward movement, lifts the spring ,77 out of engagement with the armature 7 6, opening the circuit through the lamp 55 at contacts 77 7 8, efiacing the said lamp signal and also allowing the armature 76 to retract. The energization of the magnet 86 attracts the armature 89 thereby moving the arm 91 into engagement with the spring 83 and the armature 89 continuing upward, the said spring 83 is moved out of contact 7 with the spring 84, opening the circuit for the lamp 56 and etlacing the said lamp signal. The upward movement of the spring 83 also allows the armature 82 to retract.

The operator now restores the key K, opening the contact .87, thereby opening the circuit through the magnets 85, 86 .andthe .said magnets are now deenergized, retracting their armatures 88 and 89, allowing the springs 77 and 83 to again rest upon the upper edge of their respective armatures 76 and 82. The relays AS and OS are now at normal and the lamp signals 55 and 56 are efi'aced. The operator now withdraws the plug P from the jack J, opening the circuit through the relay CO, de'energizing the said relay which restores its contacts 15 and 16 to normal and allowing the spring 13 to rest in engagement with the armature 8. The magnets LR and C0 are now at normal. The plug P is now withdrawn opening circuit for the relays 69 and CO deenergizing the said relays and the relay 69 retracting its armature 68. The deenergization of the relay CO restores the contacts 15 and 16 to their normal position, also allowing the spring 13 to again rest in engagement with the upper edge of the armature 8 The two subscribers lines and the cord circuit'hav-ing now been restored to normal, are available for another connection.

Referring now to Fig. 8, a well-known form of common battery telephone line is here illustrated, but using the relay of my invention in place of the ordinary cut-off and line relays. While I have shown no cord circuit for connection with the line circuit of Fig, 8, the well-known Kellogg four relay common battery cord circuit is adapted to be used in connection with the sai li e- The operation of the system of Fig. 8 is as follows: The subscriber at G removes the receiver 2 from its switch-hook, closing a circuit through the magnet LB from battery, through the winding of the said magnet, normal contact 93, line limb 57, the telephone of subscriber at .0, line limb 58, normal contact 93 to ground, energizing the said magnet LE9, and attracting the armature ,94. The attraction of the said armature 94 allows the spring 95 to move to its alternateposition, contacting with the spring 96 closing a circuit through the line lamp 59 from ground through contacts 95, 96 and the said lamp'signal 59 to battery, lighting the said lamp. I

The operator responds to the display of the said signal by inserting a plug of the cord circuit referred to,- into one of the jacks J the sleeve of the plug contacting with the sleeve .97, and spring 98 of the jack J closing a circuit through the magnet CO from battery at the sleeve contact of the plug, through sleeve contact 97 of jack J the winding of the said magnet CO energizing the said magnet, opening the contacts 94, 93 and disconnecting the mag- Ilet LE from the line of'the subscriber at C. The energization of the said magnet CO moves the .arm '99 upward, engaging the spring 95 and restoring it to its normal position, opening the circuit for the lamp 59, and also allowing the armature 94 to retract. The operator now ascertains the wants of the calling subscriber at O and should a connection be desired with another subscriber, the operator completes the connection in a well vknown manner.

After the subscriber at C has finished coni versation, a disconnect signal is received by the operator in a well known manner and the operator withdraws the answering plug of the cord circuit from the jack J 2 opening the circuit for the relay C0 The said'relay is now deenergized restoring the contacts 193, .93 :to normal and the arm 99 moving ment, many changes being possible without departing from the spirit or scope of my inventio hat I claim as new and desire to secure by United States Letters Patent is:

1. A telephone system including a calling telephone line and a called telephone line, an operators link circuit for connecting said lines in a conversational circuit, an electromagnet provided with a winding connected in bridge of the link circuit operable over the connected calling line, a second electromagnet provided with a winding also connected in bridge of the link circuit and operable over the connected called line, an answering supervisory signal under the control of said first electromagnet, a calling supervisory sig nal under the control of said second electromagnet, mechanical means for locking said first electromagnet in energized position, mechanical means for locking said second magnet in energized position, an electromagnet for releasing said first electromagnet, an electromagnet for releasing said second electromagnet, and a releasing circuit for said last electromagnets including said magnets in series and an operator-controlled switch contact.

2. A. telephone system including telephone lines, an operators cord circuit for interconnecting said lines, inductive devices c0nnecting the answering and calling terminals of the cord circuit, an electromagnet at each end of the cord circuit bridged across the talking strands thereof and operable over the connected telephone lines, supervisory Copies of this patent may be obtained for five cents each, by addressing the signals, contacts controlled by each of the said magnets for controlling circuits for said supervisory signals, a mechanical lock for each set of contacts to maintain them in their actuated position, a releasing electromagnet for each lock for restoring the associated contacts, and a restoring circuit for said electromagnets including said electromagnets in series and an operator-controlled switch contact.

3. A telephone system including subscribers telephone lines, an operators link circuit for interconnecting said lines, inductive devices connecting the answering and calling ends of the link circuit, an electromagnet connected in bridge of the talking strands for each end of the link circuit, contacts controlled by each magnet and mechanical locks for holding them in actuated position, a supervisory signal controlled by each set of said contacts, a releasing magnet for each lock for restoring its associated contacts, and a series energizing circuit for said release magnets including an operatorcontrolled switch.

Signed by me at Monticello, county of Jefferson and State of Florida, in the presence of two witnesses.

CHARLES A. SIMPSON.

Witnesses:

J. F. WILLIAMS, W. E. EVANS.

Commissioner of Patents,

Washington, D. G. 

